uvm_fault(0xfffWAffRNd8IN0G6:a SfP0L2 5NOd8T , LO0Wx0E,RE 0D , ON1) S Y-S>C AeL L k9e1 r5ne59l3:4 5p9a2g8e E XfaITul 0t 9t raStopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *250656 33182 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7b762156f0f0, count: 14 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu0: uvm_fault(0xfffffd806af025d8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7b762156f0f0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a373d30 rbx 0 rdx 0 rcx 0xffff80002a2b3770 rax 0x3a r8 0xffff80002a373c60 r9 0xffff80002a373928 r10 0x236b0f2a7ac87c08 r11 0xbc4fc6ef4e8fa81f r12 0 r13 0 r14 0xffff80002a2b3770 r15 0 rip 0xffffffff82ef53ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a373cb0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=250656 pid=33182 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=53, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2b2548,0xffff8000ffff3ca8 process=0xffff80002a2dd358 user=0xffff80002a36e000, vmspace=0xfffffd800b0273d0 estcpu=3, cpticks=7, pctcpu=0.3, user=0, sys=6, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 70159 201022 41219 0 2 0 syz-executor 70159 439555 41219 0 2 0x4000000 syz-executor 97226 150803 56317 0 2 0xc80 syz-executor 97226 303609 56317 0 3 0x4000080 ttyin syz-executor 97226 155842 56317 0 3 0x4000080 fsleep syz-executor 659 402501 0 0 3 0x14200 bored sosplice 6358 124750 73238 0 2 0x4000c80 syz-executor 6358 52751 73238 0 3 0x4000080 ttyin syz-executor 6358 375006 73238 0 3 0x4000080 fsleep syz-executor 55583 42217 55940 0 3 0x80 nanoslp syz-executor 55583 262366 55940 0 3 0x4000080 sbwait syz-executor 55583 12214 55940 0 3 0x4000080 fsleep syz-executor 63300 227561 0 0 3 0x14200 acct acct 41219 139717 25557 0 3 0x82 nanoslp syz-executor 13462 80707 25557 0 3 0x82 wait syz-executor 56317 455103 25557 0 3 0x82 nanoslp syz-executor 42176 432866 25557 0 2 0xc82 syz-executor 55940 522035 25557 0 3 0x82 nanoslp syz-executor *33182 250656 25557 0 7 0x2 syz-executor 42887 208681 25557 0 2 0xc82 syz-executor 73238 121910 25557 0 3 0x82 nanoslp syz-executor 25557 285271 69083 0 3 0x82 kqread syz-executor 69083 144241 23024 0 3 0x10008a sigsusp ksh 23024 25403 23838 0 3 0x98 kqread sshd-session 23838 194912 78460 0 3 0x92 kqread sshd-session 30408 138334 1 0 3 0x100083 ttyin getty 78460 123875 1 0 3 0x88 kqread sshd 6678 284507 93342 74 3 0x1100092 bpf pflogd 93342 503902 1 0 3 0x80 sbwait pflogd 19734 319277 19800 73 3 0x1100090 kqread syslogd 19800 386575 1 0 3 0x100082 sbwait syslogd 59822 335084 1 0 3 0x100080 kqread resolvd 12131 102779 69282 77 3 0x100092 kqread dhcpleased 9197 392431 69282 77 3 0x100092 kqread dhcpleased 69282 480749 1 0 3 0x80 kqread dhcpleased 72587 214177 0 0 3 0x14200 bored smr 74130 154380 0 0 3 0x14200 pgzero zerothread 17885 392505 0 0 3 0x14200 aiodoned aiodoned 54914 59097 0 0 3 0x14200 syncer update 53398 22201 0 0 3 0x14200 cleaner cleaner 76097 409692 0 0 3 0x14200 reaper reaper 90703 394058 0 0 3 0x14200 pgdaemon pagedaemon 6992 244260 0 0 3 0x14200 bored viomb 65495 114936 0 0 3 0x40014200 acpi0 acpi0 55470 505934 0 0 3 0x40014200 idle1 85232 322166 0 0 3 0x14200 bored softnet7 5807 21812 0 0 3 0x14200 bored softnet6 44905 346420 0 0 3 0x14200 bored softnet5 86168 163484 0 0 3 0x14200 bored softnet4 99152 173925 0 0 3 0x14200 bored softnet3 62003 519234 0 0 3 0x14200 bored softnet2 48816 42976 0 0 3 0x14200 bored softnet1 50384 474029 0 0 2 0x14200 softnet0 60674 423576 0 0 3 0x14200 bored systqmp 81245 471526 0 0 3 0x14200 bored systq 4570 372513 0 0 3 0x14200 tmoslp softclockmp 28478 327336 0 0 3 0x40014200 tmoslp softclock 8653 323872 0 0 3 0x40014200 idle0 1 94254 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &newfdp->fd_fd.fd_fplock r = 0 (0xffff80002a2f3b80) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 fd_checkclosed+0x48 sys/kern/kern_descrip.c:271 #4 kqueue_register+0xd96 sys/kern/kern_event.c:1504 #5 ppollregister_evts+0xca sys/kern/sys_generic.c:1044 #6 ppollregister+0x32f sys/kern/sys_generic.c:1142 #7 doppoll+0x214 sys/kern/sys_generic.c:959 #8 sys_poll+0xd8 sys/kern/sys_generic.c:-1 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #10 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10216 11133K 11356K 166960K 11435 0 pcb 17 12K 12K 166960K 43 0 rtable 151 4K 6K 166960K 263 0 pf 31 17K 21K 166960K 63 0 ifaddr 34 5K 7K 166960K 52 0 ifgroup 47 2K 2K 166960K 66 0 sysctl 4 1K 9K 166960K 8 0 counters 64 36K 37K 166960K 208 0 ioctlops 0 0K 4K 166960K 1570 0 iov 0 0K 2K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1339 84K 84K 166960K 1440 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 239 0 sigio 0 0K 0K 166960K 4 0 proc 71 115K 180K 166960K 541 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 15 0 in_multi 74 5K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 364 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 260 169K 176K 166960K 3820 0 UVM aobj 8 2K 2K 166960K 8 0 pinsyscall 43 86K 103K 166960K 1317 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 8 0 NDP 10 0K 1K 166960K 32 0 temp 37 8642K 8710K 166960K 11237 0 kqueue 14 22K 26K 166960K 40 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 38 0 33 1 0 1 1 0 8 0 rtentry 176 97 0 31 5 0 5 5 0 8 0 unpcb 144 220 0 201 6 0 6 6 0 8 4 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 37 0 31 1 0 1 1 0 8 0 arp 128 10 0 2 1 0 1 1 0 8 0 inpcb 328 152 0 140 2 0 2 2 0 8 0 nd6 144 17 0 4 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 69 0 69 1 0 1 1 0 8 1 pppxif 1504 65 0 65 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 24 0 0 1 0 1 1 0 8 0 pfstkey 128 24 0 0 1 0 1 1 0 8 0 pfstate 384 23 0 0 3 0 3 3 0 8 0 pfrule 1344 23 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 445 0 131 28 0 28 28 0 8 5 art_table 40 446 0 131 5 0 5 5 0 8 0 art_node 32 97 0 39 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1771 0 260 95 0 95 95 0 8 0 ffsino 296 1771 0 260 117 0 117 117 0 8 0 nchpl 144 2098 0 407 63 0 63 63 0 8 0 uvmvnodes 80 1899 0 0 39 0 39 39 0 8 0 vnodes 216 1899 0 0 106 0 106 106 0 8 0 namei 1024 6475 0 6475 2 0 2 2 0 8 2 percpumem 16 119 0 72 1 0 1 1 0 8 0 kstatmem 264 34 0 12 3 0 3 3 0 8 1 scxspl 216 7405 0 7405 3 1 2 2 1 8 2 plimitpl 152 73 0 55 1 0 1 1 0 8 0 sigapl 424 544 0 488 7 0 7 7 0 8 0 knotepl 120 291 0 0 9 0 9 9 0 8 0 kqueuepl 224 53 0 42 1 0 1 1 0 8 0 pipepl 344 113 0 85 3 0 3 3 0 8 0 fdescpl 528 519 0 487 3 0 3 3 0 8 0 filepl 160 2223 0 1979 16 0 16 16 0 8 4 lockfpl 104 139 0 133 1 0 1 1 0 8 0 lockfspl 48 32 0 26 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 169 0 155 1 0 1 1 0 8 0 zombiepl 144 492 0 488 1 0 1 1 0 8 0 processpl 1232 544 0 488 5 0 5 5 0 8 0 procpl 664 712 0 649 6 0 6 6 0 8 0 sockpl 752 414 0 378 18 0 18 18 0 8 13 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 212 0 0 13 0 13 13 0 8 0 bufpl 280 3201 0 122 220 0 220 220 0 8 0 anonpl 32 7498 0 0 61 0 61 61 0 246 0 amapchunkpl 152 11386 0 10724 29 3 26 26 0 158 0 amappl16 200 2549 0 2519 16 5 11 15 0 8 8 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 110 0 98 1 0 1 1 0 8 0 amappl13 176 7 0 7 2 2 0 1 0 8 0 amappl12 168 1184 0 1152 3 1 2 2 0 8 0 amappl11 160 49 0 35 1 0 1 1 0 8 0 amappl10 152 29 0 29 1 1 0 1 0 8 0 amappl9 144 283 0 283 1 1 0 1 0 8 0 amappl8 136 85 0 83 1 0 1 1 0 8 0 amappl7 128 122 0 110 1 0 1 1 0 8 0 amappl6 120 178 0 175 1 0 1 1 0 8 0 amappl5 112 126 0 117 1 0 1 1 0 8 0 amappl4 104 296 0 276 1 0 1 1 0 8 0 amappl3 96 1910 0 1791 5 1 4 4 0 8 0 amappl2 88 688 0 627 2 0 2 2 0 8 0 amappl1 80 8438 0 7847 14 0 14 14 0 8 1 amappl 88 3135 0 2950 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 1 1 1 0 8 1 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 519 0 487 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 519 0 487 1 0 1 1 0 8 0 vmmpekpl 168 5775 0 5742 2 0 2 2 0 8 0 vmmpepl 168 39892 0 37863 99 0 99 99 0 357 10 vmsppl 488 518 0 487 5 0 5 5 0 8 0 rwobjpl 80 15841 0 13003 60 0 60 60 0 8 1 pdppl 4096 1045 0 974 97 24 73 85 0 8 2 pvpl 32 14461 0 0 117 0 117 117 0 265 0 pmappl 256 518 0 487 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 271 0 26 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8385dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:654 comcnputc(800,61) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,61) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(61) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(61) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff83339443) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c484fa0) at db_ktrap+0x1c7 sys/arch/amd64/amd64/db_interface.c:129 kerntrap(ffff80003c484fa0) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:482 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001486000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003b046028) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003b046028) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 end trace frame: 0xffff80003c485140, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8385dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:654 comcnputc(800,61) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,61) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(61) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(61) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff83339443) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c484fa0) at db_ktrap+0x1c7 sys/arch/amd64/amd64/db_interface.c:129 kerntrap(ffff80003c484fa0) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:482 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001486000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003b046028) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003b046028) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c485150) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8066e9cbd8,81,fffffd80097fb750,ffff80003b046028) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8067b480f8,ffff80003b046028) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8067b480f8,ffff80003b046028) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8067b480f8,ffff80003b046028) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8067b480f8,ffff80003b046028) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003b046028) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003b046028,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003b046028,ffff80003c4854c0,ffff80003c485410) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4854c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4854c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72c5d40de110, count: -24 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7b762156f0f0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7b762156f0f0, count: -1